Vulnerability CVE-2015-0239
Published: 2015-03-02

Description:
The em_sysenter function in arch/x86/kvm/emulate.c in the Linux kernel before 3.18.5, when the guest OS lacks SYSENTER MSR initialization, allows guest OS users to gain guest OS privileges or cause a denial of service (guest OS crash) by triggering use of a 16-bit code segment for emulation of a SYSENTER instruction.

CVSS2 => (AV:L/AC:H/Au:N/C:N/I:P/A:C)

CVSS Base Score
Impact Subscore
Exploitability Subscore
4.7/10
7.8/10
1.9/10
Exploit range
Attack complexity
Authentication
Local
High
No required
Confidentiality impact
Integrity impact
Availability impact
None
Partial
Complete
Affected software
Linux -> Linux kernel 
Canonical -> Ubuntu linux 

 References:
http://git.kernel.org/?p=linux/kernel/git/torvalds/linux-2.6.git;a=commit;h=f3747379accba8e95d70cec0eae0582c8c182050
http://permalink.gmane.org/gmane.linux.kernel.commits.head/502245
http://rhn.redhat.com/errata/RHSA-2015-1272.html
http://www.debian.org/security/2015/dsa-3170
http://www.kernel.org/pub/linux/kernel/v3.x/ChangeLog-3.18.5
http://www.mandriva.com/security/advisories?name=MDVSA-2015:058
http://www.openwall.com/lists/oss-security/2015/01/27/6
http://www.oracle.com/technetwork/topics/security/linuxbulletinjan2016-2867209.html
http://www.oracle.com/technetwork/topics/security/linuxbulletinoct2015-2719645.html
http://www.securityfocus.com/bid/72842
http://www.ubuntu.com/usn/USN-2513-1
http://www.ubuntu.com/usn/USN-2514-1
http://www.ubuntu.com/usn/USN-2515-1
http://www.ubuntu.com/usn/USN-2516-1
http://www.ubuntu.com/usn/USN-2517-1
http://www.ubuntu.com/usn/USN-2518-1
https://bugzilla.redhat.com/show_bug.cgi?id=1186448
https://github.com/torvalds/linux/commit/f3747379accba8e95d70cec0eae0582c8c182050
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